Multiple plug and socket for portable telephone stations



Feb. 26, 19 29.

F. KUKE MULTIPLE PLUG AND SOCKET FOR PORTABLE TELEPHONE S 1TATIONS Filed May 28, 1927 Patented Feb. 28, 1929.

UNITED STATES I y I 1,703,492 PATENT OFFICE.

- FRITZ KUKE, QF ERLIN, ERMAN IVIULTIPLE PLUG AND SOCKET FOR PORTABLE TELEPHONE STATIONS.

Application filed May 28, 1927, Serial. No. 195,111, and in Germany November 25, 1926.

This invention relates to telephone stations, more particularly to multiple plugs and sockets for portable telephone stations, which may be plugged in at any place where sockets are provided.

' The object of the present invention is to provide multiple plugs and sockets of an imcovers the contact bolt and springs and.

leaves room for the plug to enter. This-latter resembles plugs as usual with telephone switchboards. It contains a central bolt, to which are threaded, concentrically, so many metal sleeves, insulated from each other and the central bolt, as leads are to be provided. The sleeves are held in position by a nut screwed to the inside end of the central bolt. A handle of insulating material is screwed tothe outer metal sleeve. 'Its back end contains a hole through which the phone cord is threaded. The strain cord of the latter 1s tied to a pin inside of the hollow handle. A special feature oi the plug is that the central bolt is provided witlra hole to receive the upper slit part of the central cont-act bolt 01 the socket. By this means the plug may be designed much shorter than the usual plugs are. The back end of the plug handle is provided with a wire helix for the protection of the phone cord, the ends of which helix are held by metal rings so that they cannot cut into the cord running through.

Referring to the drawings: v

Figure 1 is a View oi the interior of the socket, thebase and cover in section.

Figure 2 isa detailed view of the bolt and the different contact springs of the socket showing the assemblage of these parts.

Figure 3 is a sectional view of the multiple-way plug.

The socket base 1 and cover 2 o'finsulating material. In the upper central hole of the cap 2 is seen a cylindrical contact bolt 3. The upper slit part of this bolt is divided from the middle part by a shoulder, while the lower threaded part passes through the base plate 1 to which (Figures 1 and 2) contains a:

so that the springs are distributed round the bolt in such a way that they cannot touch each other, except if a special break contact is to be provided as shown at 5, 5'. The screws 8 aroused to fasten the leads of the telephone cable. They may be provided on the contact springs themselves or, as shown in Figure 1, on special metal pieces 3, 5", 6, 7 which are in touchwith the bolt 3 and the respective contact'springs and are held by the bolt 3 in the same way as said springs. T he binding screws 8 might as well be revidually insulated. The out-er ends of parts 10 and 11 are thickened, while part 12 is threaded on its outer surface.- 10, 11, 12may possess circular grooves to All three secure fast'clamping of the contact spri 5, 6, 7) of the socket. The'insulated central bolt 9 serves for holding together the parts 10, 11, 12 by means of the nut 13, as well as the bail 14; carrying a split pin 14 to which hollowed bolt 9 are so long as to allow to serve as a safe guide for the plug. The screws 15. are. used to clamp the leads of the cable to the different, parts ofthe plug. A

1 handle 16 ofinsulating material is screwed to the metal body 12. Where the cable or cord enters, the handle carries asteel wire helix 17 which avoids abrupt bending of the cord. The ends of helix 17 are held in metal rings 17 17" against chafing of the phone cord.

Having now particularly described and eoncen trical contact pieccs,.one or more of these contact pieces provided with circularvgrooves; in the socket a central pin holding in position a plurali v 'ofbentco" insiiilated l'roin'ea'clrother hind "trein said pin; said contact springs engaging, with their contact taces, in the grooves of said contact pieces of the plug.

lhecombinationol a n'uilti ple wayplug end-socket, a j iluralitg o't bent contact springs held by a eentmlcontaet pinin the socket; cooperating therewith in the plug, a central bolt andasuiitablenumber o t' cont t pieces, concentrical with sad bolt; an nsulatingz; plug handle screwed on the out r contact piece, -a steel wire helix fastened in theepen back end of-seid plug; handle, nietal rings holdinglthe ends of said helixlto' avoidchaling oi"- the phone cord run through the protecting helix into the interior sotthe plug.

4;. The combination of a inultipl e Way plug and socket; in-the'plug a pl urality*otcontaot pieces slipped over a central nietal boltrsaid bolt containing; in its front end acylindrical borenapt to receivea slit contect'holt placed 'flliiid he Wall socketandcarrying around it 'le number of bent c'ontactsprings.

.-e'co1nbiniition o't 'a'i'nultiple way plug zind sooliett 1 theplug a holloi'v-tipped contact bolt carrying several individually insuinsulating material covering the contacting parts of the Wall socket; nnopening in-said *cover givingaccess to the plugto get into engag reinent with the respective parts of the socket. V

"6. The combination of a multiple way plug and socket; in the plug a llOllOW-tlPPQ-Cl'CQD- Ztrsl contact bolt a plurality olzinsulated contact rings slipped over said-bolt; corresponding thereto, in the socket, -a suitable number of bent contact springs insulated "from each otherby the interposition ozt-insulating washers; said bent springs and Washers'slipped over the middle partiot a slit Contact pin; an insulating sleeve interposed between said cont'act p n and contactsprings a flattening on the ev r side of said sleeve,corresponding v(iattenings in the holes of said bent con-tacsprings the flattening of the hole of each 53 being shifted with :respect to :the flatinejs of the other springs; a pairof nuts screwed to "the'slou er part of said contact pin clampingtogether and to the insulating base piateithe wholenssembly of contact springs;

cap of insulating material with an open.- inp; inits'top,:allowinglthe plugtoenter.

lDa-tedthis ltlrday of May, 1927. Intes'thnony whereof I my sieznature.

FRITZ 'KUKE. 

